I want to apply only one coupon at a time in a cart page either automatic apply else manually coupon code. In that we apply only one and I also added stop furture using button yes. But dynamic coupon apply and automatic coupon both are applied. so how to do only one applicable coupon in cart page.
Go to Promotions > Shopping Cart Price Rules and click on the row that contains the coupon code in question. In the "Actions" tab is a setting called
Stop Further Rules Processing. Set that to Yes and then flush your cache. This option prevents other discounts from being applied.